IfcPath

Semantic definitions at the entity

Entity definition

NOTE Definition according to ISO/CD 10303-42:1992
A path is a topological entity consisting of an ordered collection of oriented edges, such that the edge start vertex of each edge coincides with the edge end of its predecessor. The path is ordered from the edge start of the first oriented edge to the edge end of the last edge. The BOOLEAN value sense in the oriented edge indicates whether the edge direction agrees with the direction of the path (TRUE) or is the opposite direction (FALSE).

An individual edge can only be referenced once by an individual path. An edge can be referenced by multiple paths. An edge can exist independently of a path.

NOTE Entity adapted from path defined in ISO 10303-42.

HISTORY New entity in IFC2.0

Informal Propositions:

A path has dimensionality 1.
A path is arcwise connected.
The edges of the path do not intersect except at common vertices.
A path has a finite, non-zero extent.

Attribute definitions

#	Attribute	Type	Cardinality	Description	C
1	EdgeList	IfcOrientedEdge	~L[1:?]	The list of oriented edges which are concatenated together to form this path.	X

Formal Propositions

Rule	Description
IsContinuous	The end vertex of each edge shall be the same as the start vertex of its successor.

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
IfcRepresentationItem
	LayerAssignment	IfcPresentationLayerAssignment @AssignedItems	S[0:1]	Assignment of the representation item to a single or multiple layer(s). The LayerAssignments can override a LayerAssignments of the IfcRepresentation it is used within the list of Items.	X
	StyledByItem	IfcStyledItem @Item	S[0:1]	Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve.	X
IfcTopologicalRepresentationItem
IfcPath
1	EdgeList	IfcOrientedEdge	~L[1:?]	The list of oriented edges which are concatenated together to form this path.	X

Formal representations

XSD Specification

 <xs:element name="IfcPath" type="ifc:IfcPath" substitutionGroup="ifc:IfcTopologicalRepresentationItem" nillable="true"/>

 <xs:complexType name="IfcPath">

  <xs:complexContent>

   <xs:extension base="ifc:IfcTopologicalRepresentationItem">

    <xs:sequence>

     <xs:element name="EdgeList">

      <xs:complexType>

       <xs:sequence>

        <xs:element ref="ifc:IfcOrientedEdge" maxOccurs="unbounded"/>

       </xs:sequence>

       <xs:attribute ref="ifc:itemType" fixed="ifc:IfcOrientedEdge"/>

       <xs:attribute ref="ifc:cType" fixed="list-unique"/>

       <xs:attribute ref="ifc:arraySize" use="optional"/>

      </xs:complexType>

     </xs:element>

    </xs:sequence>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcPath

 SUBTYPE OF (IfcTopologicalRepresentationItem);

  EdgeList : LIST [1:?] OF UNIQUE IfcOrientedEdge;

 WHERE

  IsContinuous : IfcPathHeadToTail(SELF);
END_ENTITY;

 EXPRESS-G diagram

	Pfad - Topologie
	Path
	Chemin